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Hi, 大家好,我在用QGraphicsView 和QGraphicsScene 来处理大量items的时候,特别慢。 请教一下有什么办法可以加速GUI的速度?或者如何选择性的渲染? 比如在full view的时候只显示个模糊的图,当zoom in的时候,可以慢慢显示细节。